package acm.蓝桥19;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StreamTokenizer;


class Reader {
	static StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
	static PrintWriter pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

	public Reader(Object... o) {
	}

	public int nextInt() {
		try {
			in.nextToken();
		} catch (Exception ignored) {
		}
		return (int) in.nval;
	}
}